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G. E. AND J. L. JACOBSON.

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P m W G, E. AND J. L. JACOBSON.

BOILER.

APPLICATION FILED JULY 12. 1916.

Patented Dec .2 SHEETSHEET 2.

' ATTORNEY.

ED STATES NT Ff@.

GUSTAVE E. JAGOBSON AND JOHN L. JACOBSON, OF NEWARK, NEW JERSEY.

BOILER.

Specification of Letters Patent. Patgntgd D 31), 1919 Application filed July 12, 1916. Serial No. 108,769.

following is a specification.

This invention relates more particularly to boilers in which coils of pipe are employed for obtaining an extensive heating surface,

and more especially to such boilers for use in house heating.

' tomary in The objects of the invention are to provide such a boiler in which steam may be very quickly obtained; to obtain steam without having to bring the entire volume of water to boiling temperature; to obtain this result and yet not reduce the volume of water employed; to prevent cracking the boiler; to provide a construction adapted to be made from wrought iron; to permanently seal the joints; to. secure simplicity of construction and operation, and to obtain other advantages and results'as may be brought out in the following description.

Referring to the accompanying drawings, in which like numerals of reference indicate the same parts throughout the several views,

Figure 1 is a front elevation of a furnace having a portion of the outer jacket of the boiler broken away;

Fig. 2 is a central vertical section of the same, on line 2-2, Fig. 3, the coils beyond the transverse row of nearest ones being omitted for greater clearness, and

Fig. 3 is a diagrammatic underneath view of the'lower ends of the coils, a full showing of the individual coils for clearness.

In the specific embodiment of the invention illustrated in said drawings, reference numeral 1 indicates a furnace having an ash pit or base 2 surmounted by a boiler 8 with a fire grate 4: between, as is custhe construction of furnaces. The boiler preferably comprises a cylindrical inner shell 5 and a cylindrical outer jacket 6 substantially coaxial and spaced apart so as to leave an annular chamber 7 between them, see Figs. 2 and 3. At their upper ends, the shell and jacket are directed radially inward forming top portions 8, 9, respectively, which are spaced apart and form between themselves a continuation of the chamber 7 A smoke flue 10 preferably extends up through the middle of the top portions for the escape of the gases of combustion from the grate, and this smoke flue is attached to the top portions 8, 9 of the shell and jacket with an impervious joint so as to prevent the escape of steam or water. The upper end of the smoke flue projects abovethe upper top portion 9, forming a collar 11 for attachment of the usual stove pipe (not shown). A steam pipe 12 leads from the top of the boiler and a return pipe 13 leads to the bottom, Fig. 1, it being understood that with a fire on the grate the water contained within the chamber 7 W111 be heated to boiling temperature,

and the steam thus obtained carried through pipe 12 for whatsoever purpose desired.

In order to obtain steam more quickly and to utilize more fully the heat from the fire, we provide a plurality of coils within the inner shell 5 and at a suific'ient distance above the grate to allow a fire to be made therebeneath. We have shown each coil as comprising a plurality of convolutions of a single piece of pipe the lower end of which leads through the inner shell 5 and opens into the chamber 7 about midway of the height of the chamber; the upper ends of the coils also open into said chamber at or adjacent to the top thereof, as next to be more particularly described. It will be observed from the drawings that the coils are arranged in two annular series, the upper or outlet ends of the coils 14: of the outer series or series next to the inner shell opening into the chamber 7 through the vertical or side wall of the shell, and the coils 15 of the inner series having their upper or outlet ends opening through the inner top wall 8 of the shell near the flue 10. It will be understood, however, that although this has been found to be the most convenient and eflicient arrangement under conditions so far tried, the ends of the coils may be arranged otherwise if so desired. One coil 16 is at the middle of the boiler, and opens at its upper end through the top wall 8 of the inner shell, also, like the coils 15 of the inner annular series.

Preferablythe coils 14, 15 in the two annular series of coils are tilted, that is, arranged so their longitudinal axes are not vertical, but slope somewhat from such vertical position. The coils in each series are tilted toward each other, so that one coil slopes over the next in the series which in thereof, and the holes turn slopes over the next, and so forth around the entire series of coils. Furthermore, the ends'of each coil preferably extend from the coil tangentially of the general 0ylindrical form of the coil at opposite sides in the vertical wall of the inner shell in which the ends of the coil are held are by preference arranged one on a vertical line directly above the other, as clearly shown in Fig. 1. By this arrangement, each coil not only forms a continuous upwardly inclined passage for the heated water and steam to rise in, but also exposes all the convolutions of the coil to the rising heat from the fire on the grate. Obviously, the upper ends of such coils as open through the top portion 8 of the inner shell have to be directed upwardly, but by retaining the bent part in substantially the plane of ta11- gency, the inlet and outlet for the coils may be retained in substantially a vertical plane. In the particular arrangement of coils shown, see Fig. 3, the coil at the center of the boiler is, out of necessity, arranged verticallyor substantially so, since there is insufficient room to tilt it, but this is not thought to be essential and may be varied ifdesired.

Around the smoke flue 10, between the top portions 8, 9 of the outer and inner shell, is a shield 17 which overlies the upper ends of the coil outlets which open through the top portion 8, and prevents steam from striking as jets against the outer top portion 9. This shield bends riphery and is permitted to rest for support on the inner top portion 8 of the shell. The shield 17 with its depending periphery in conjunction with the top portion 8 of the inner shell 5, forms a supplemental chamber of a smaller capacity than the annular chamber 7. The edge of the shield being much closer to the top portion 8 than the rest of the shield, a restricted outlet of less capacity than the chamber formed beneath the shield is formed between the top portion 8 and the edge of the shield, and the water passing into this small chamber under pressure is thus spread in a thin sheet over the top portion 8 so as to be quickly heated and vaporized. To permit the steam and water to pass from beneath the shield 17 into the chamber 7 and at the same time allow the depending periphery of the shield to rest upon the top portion 8 of the inner shell for support, the peripheral edge of the shield is notched or serrated at 18.

In manufacture, the inner shell and outer jacket are bentup independently, as cylinders, out of sheet metal, of the diameters desired, and the smaller one flared at its bottom, providing a lower flange 19 substantially the width of the chamber 7 desired. Alsothis smaller cylinder has holes drilled in it at proper places to receive the ends of downward at its pethe coils which are welded in position. The top portion 8 is made eparate from the cylinder and welded thereto, the smoke flue being welded to the top portion and the shield preferably welded to the smoke flue. By virtue of the flange 19, the larger cylinder forming the jacket is welded and made in tegral with respect to the smaller cylinder or inner shell, and the top portion 9, connecting the outer shell and thesmoke fine, is welded to both of said parts, whereby an integral structure is obtained which may be of wrought iron and accordingly less likely to crack than cast iron, requires less metal and is light in weight. Obviously a doorway 20 for the introduction of fuel may be cut through the front of the boiler, and ,by welding suitable flanges 21 therearoundto both the shell and jacket the chamber 7 is sealed thereat.

In use it will be understood that the boiler is filled with water to a level between the inlet and height. With a lire upon the grate, the water in the chamber 7 is heated, but the coils 14, 15, 16 beingin the direct path of the heat becomes very hot quickly and steam will rise therein even before water in the chamber 7 is hot. By this means steam is quickly emitted from the upper ends of the coils and filling the upper part of the chamber 7 is carriedofl' by the'pipe 12 for whatever purpose desired. Steam can thus be gotten up very quickly by our improved construction.

Obviously various changes-may be made in our improved boiler be understood as limiting ourselves except as required by the following claims when construed in the light ofthe prior art.

Having thus described the invention, what we claim is:

modifications and the manufacture of 1. In a boiler, an inner shell and an outer" jacket forming inside themselves a heating chamber and between themselves a water chamber having a lower vertical annular portion and an upper inward annular extension, a pipe in said heat chamber opening at its lower end into the vertical portion of the water chamber and opening at its upper end into the upper inward extension of said chamber, around the heat chamber in said upper extension of the water chamber and spaced from the floor thereofoverlyingthe upper end of the said. pipe, the'peripheral edge of said shield being turned downwardly toward the floor of the said extension and cooperating therewithto form a restricted outlet ofless capacity than the chamber beneath the shield to spread the water in a thin sheet over the floor of the said upper extension.

and we do not wish to and. an annular shield outlet of the coils,so that water 'stands in the coils" for only part; of their portion tension, a pipe in sald heat chamber opening 2. In a boiler, an inner shell and an outer jacket forming inside themselves a heat chamber and betweenthemselves a water chamber having a lower vertical annular and an upper inward'annular exat its lower end into the vertical portion of the water chamber and opening at its upper end into the upper inward extension of said chamber, and an annular shield around the heat chamber in the said upper extension of the water chamber and spaced from the floor thereof overlyingthe upper end of the said pipe, the said shield beingturned downwardly and resting upon the floor of the said upper extension of the water chamber and forming a restricted outlet of less capacity than the chamber beneath the shield to spread the water in a thin sheet over the floor of the said upper extension of the water chamber.

3. In a boiler, an inner shell and an outer jacket forming inside themselves a heat a the peripheral edge of chamber and between themselves a water chamber having a lower vertical annular portion and an upper inward annular extension, a pipe in said heat chamber opening at its lower end into the vertical portion of the water chamber and opening at its upper end into the upper inward extension of said chamber, and an annular shield around the heat chamber in said upper extension of the water chamber and spaced from the floor thereof overlying the upper end of the said pipe, the peripheral edge of the said shield being turned downwardly and resting upon the floor of the said upper extension of the water chamber for support, said peripheral edge being notched to form a restricted outlet of less capacity than the chamber beneath the shield to spread the water in thin sheet over the floor of the upper extension of the water chamber.

GUSTAVE E. JACO'BSON. JOHN L. JACOBSON. 

